Coal-drilling apparatus



(No 80181. 3 Sheets-Sheet 1.

. M. A. MIOHALES. 8

GOAL DRILLING APPARATUS. 180588 524. v Patented Sept. 11,1888.

INVENTOR,

I v gw bmm n ruins. Plumunw nuv wman m o. q

(No Model Q); Y 3 Sheets-Sheet 2. M. A. MIGHALES.

GOAL DRILLING APPARATUS.

' o; 389,524. Patented Sept. 11, 1888.

M Mb W 3 Sheets-$heet 3.

(No Model.)

M. A. MICHALBS.

COAL DRILLING APPARATUS.

No; 389,524. Patented'Sept. 11, '1888.

Att y u PETERS. Phomufiwgn her. w

tions of the drill-rotating device.

UNITED STATES PATENT OFFICE.

MOSES A. MICHALES, OF ALLEGHENY, ASSIGNOR TO JOHN T. MOORE, OF

PITTSBURG, PENNSYLVANIA.

COAL-DRILLING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 389,524, datedSeptember 11, 1888.

Application filed September 23, 1887. Serial No. 250.486. (No model.)

To all whom it may concern:

Be it known that I, MosEs A. MIoHALEs, residing at Allegheny, in thecounty of Allegheny and State of Pennsylvania, a citizen of the UnitedStates, have invented or discovered certain new and useful Improvementsin Coal-Drilling Apparatus, of which improve ments the following isaspecification.

The invention herein relates to certain improvements in drills orcutters for mining of coal and other minerals, and has for'its objectsuch a construction and arrangement of parts as will permit of easytransportation of the apparatus from place to place, its readyadjustment while at work, and the delivery of rapid powerful blows whoseforce or effectiveness is to a great extent independent of the length ofmovement of the cutting-tool.

In general terms the invention consists in the construction andcombination of parts substantially as hereinafter more fully describedand claimed.

In the accompanying drawings, forming a part of this specification,Figures 1 and 2 are plan views of my improved apparatus, the cover ofthe box or case being removed, showing the relative positions of theparts at the limits of the movement of the drill. Fig. 3is a verticalsectional view on the line as m, Fig. 1. Fig. 4 is a sectional view, onan enlarged scale, taken in the line y y, Fig. 1. Fig. 5 is a sectionalView similar to Fig. 3 of the front end of the apparatus, showing amodification of the drill-rotating mechanism. Figs. 6 and 7 aresectional plan views of further modificavertical section on the line 3 3Fig. 6. Fig. 9 is a sectional plan of the mechanism shown in Fig. 5.Fig. 10 is a perspective View showing the manner of mountingthe drill.Fig. 11 is an elevation of y the same, and Fig. 12 is a sectional detailview of the joint between the drill and stand.

In the practice of my invention a small electric motor, 1, is secured atone end of a box or case, 2, and to one end of its power-shaft issecured a bevel-pinion, 3, which intermeshcs with a correspondingpinion, 4, secured to the shaft 5, mounted in suitable bearings formedin the top and bottom of the case or box 2.

Fig. 8 is a On the shaft 5 is secured a wiper-wheel, 6, whoseprojections or fingers 7 engage in their revolutions with the end of alever, 8, which is pivoted on a shaft or pin, 9, passingthrough suitablebearings formed in the top and bottom of the case near its front end. Inthe forward end of the lever is arranged the toolstock 10, so mounted asto be capable of rotation around its axjs, and provided. with a socket,11, in which the drills orcutting-tools can be secured. On the drill issecured a bevel-pinion, 12, intermeshing with a corresponding pinion,13, on the shaft 14, mounted in suitable bearings, 15, formed on oneside of the lever 8. On theinner end of the shaft 14 is keyed aratchet-wheel, 16, which is rotated during the reciprocation of .thelever by engagement with a spring-finger, 17, attached to the case orbox. (See Figs. 1, 2, and 3.) The rotation of the wiper-wheel causes itsfingers to engage the tail of the lever 8 and shift the same to oneside, thereby extending the spring 18, connected to the lever at a pointbeyond its fulcrum or pivot-pin 9 and to one side of the case. As thefingers of the wiper-wheel in its revolutions slip off the rear end ofthe lever, the latter is violently shifted in the opposite direction bythe contraction of the spring,and thereby causing the drill attached tothe front end of the lever to strike a hard quick blow proportionate tothe power of the spring. As the lever is again shifted by the action ofthe wiper-wheel, the spring-finger 17 engages the ratchet-wheel. 16 andpartially rotates the same, and with it the drill-stock and drill.

On the top and bottom of the case, near the rear end of the lever, areformed segmental guides 19,to insure an even and regular movement of thelever, and a stop, 20, is also provided to limit the movement of thelever when operated on by the spring, said stop being faced with rubberor other suitable cushion to prevent a violent concussion from the blowsof the lever. The force of the blows delivered can be regulated byemploying springs of varying strength or by adjusting the spring towardor away from the fulcrum.

In lieu of the above-described mechanism for rotating the drill, aratchet-Wheel, 21, can be placed on the stock 10, with which aspring-pawl, 22, on the sliding bar 23 engages. This bar is so attachedto the lever as to move therewith, and also to move freely therealong,and is provided with a laterally-projecting lug, 25, engaging aninclined groove, 24, formed in the bottom of the box or case, (see Figs.5 and 9;) or the bar 23 may be connected by a link, 26, to the box orcase (see Figs. 6, 7, and 8) at a point near the fulcrum of the lever.In both of the above-described constructions the bar 24 is reciprocatedback and forth by the movement of the lever while in operation.

The above-described apparatus can either be held by a workman while inoperation or can be supported by a suitable frame. Such a frame is shownin Figs. 10 and 11, and consists of a tripod, 27, provided with casters28, to facilitate its movement in any direction desired. On the head ofthe tripod is secured the socket 29, in which is arranged the ball 30,said ball being provided with a stem, 31, adapted to fit in sockets 32,formed on the lower and upper sides of the box or case. The balland-socketjoint permits of a large range of movement of the box or case,and the sockets 32 on the box or case'permit of a reversal of themachine, thereby enabling its use for undercutting along the breast ofcoal or other mineral from one side of the heading to the other.

In lieu of an extension spring for operating the lever, acompressionspring may be employed, and the operating-spring may beconnected to the lever on either side of the fulcrum.

Although Iprefer to employ an electric motor for operating thewiper-wheel, any suit able fiuidmotor may be employed therefor; and inlieu of the gearing connection between the motor and wiper-wheel thelatter may be secured on the shaft of the motor, if desired.

I claim herein as my invention 1. In a drilling apparatus, thecombination of a lever having a drill or cutter attached to one endthereof, a spring and wiper for operating said lever, a motor foroperating said wiper-wheel, and a frame carrying said devices andmovable in the direction of the operative blows of the cutter or drill,thereby regulating the force of said blows and compensating for thepenetration of the cutter or drill, substantially as set forth.

2. In a portable drilling apparatus, the combination ofa lever carryinga drill or cutter, a spring and wiper-wheel for operating said lever.mechanism operated by the movements of the lever for rotating the drill,and an electric motor for rotating the wiper-wheel, sub stantially asset forth.

In testimony whereof I have hereunto set my hand.

MOSES A. MICHALES.

Witnesses:

DARWIN S. WoLoo'r'r, R. H. WHITTLEsEY.

